yaooqinn commented on a change in pull request #31804:
URL: https://github.com/apache/spark/pull/31804#discussion_r593906834
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File path: sql/core/src/test/resources/log4j.properties
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@@ -22,7 +22,7 @@ log4j.rootLogger=INFO, CA, FA
log4j.appender.CA=org.apache.log4j.ConsoleAppender
log4j.appender.CA.layout=org.apache.log4j.PatternLayout
log4j.appender.CA.layout.ConversionPattern=%d{HH:mm:ss.SSS} %p %c: %m%n
-log4j.appender.CA.Threshold = WARN
+log4j.appender.CA.Threshold = FATAL
Review comment:
> But the current threshold (WARN) can help catch a bug like the
following early: [#31273
(comment)](https://github.com/apache/spark/pull/31273#issuecomment-785854571)
These warning messages still can be found in the `unit-tests.log`s. I don't
see much difference as a warning message can still be simply ignored.
But when we encounter test failures but got omitted by the CI, it is hard
for us to locate to them.
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